I will answer your questions one at a time

Yes, there is.

I will not refrain from answering your questions, and I will do so at a rate of one less than two at a time.

But seriously, I would probably just say: I will now answer your questions. And my reasoning for leaving out the "one at a time" part is that I can answer only one question at a time as I am limited by the number of mouths that I have.